A hub is the part of a wheel that connects the wheel to its axle.

The Simple English Wiktionary has a definition for: hub.

Technology

• Ethernet hub, connects all the cables in a Local Area Network
• Port multiplier, a component in Serial ATA
• USB hub, allows connecting to many devices to a single USB port

Transport

• Transport hub or transport interchange is a station which allows to switch between different lines in the transport network.
  • Airline hub, an airport used by an airline as a transfer point

Places

• Hub Tehsil, a tehsil in Pakistan
  • Hub, Balochistan, the capital of the tehsil
• Hub River, a river in Pakistan

Others

• In video games, a hub is a special Level which connects to many other levels.
• The Hub (TV channel), a television network in the United States

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